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Re: XPath 1.5? (was RE: typing and markup)

• To: xml-dev@l...
• Subject: Re: XPath 1.5? (was RE: typing and markup)
• From: Joe English <jenglish@f...>
• Date: Wed, 08 May 2002 17:46:12 -0700
• In-reply-to: <1071433640305.20020509000505@j...>
• References: <1071433640305.20020509000505@j...> <5.1.0.14.0.20020508063440.0498cd58@n...> <001901c1f5a1$88103d70$6501a8c0@pcukmka> <p04330103b8fd71b18eac@[192.168.254.4]> <5.1.0.14.0.20020507090946.04de98a8@n...> <5.1.0.14.0.20020508063440.0498cd58@n...> <5.1.0.14.0.20020508075809.048c7e98@n...>

Jeni Tennison wrote:

> There are several aspects of HTML that can't be validated by
> grammar-based schema languages, such as the fact that form elements
> shouldn't occur within other form elements at any level [...]


The HTML DTD specifies this constraint with an exclusion exception
(a feature that was left out of XML):

    <!ELEMENT FORM - - %body.content -(FORM) +(INPUT|SELECT|TEXTAREA)>

TREX can also express it concisely with a combination of CONCUR
and NOTALLOWED.  CONCUR was left out of RELAX-NG, but it can also
express this constraint, as can RELAX and any other schema language
based on tree-regular grammars.


--Joe English

  jenglish@f...

• Follow-Ups:
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  • Re: XPath 1.5? (was RE: typing and markup)
    • From: Jeni Tennison <jeni@j...>
  • Re: XPath 1.5? (was RE: typing and markup)
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  • RE: XPath 1.5? (was RE: typing and markup)
    • From: "Michael Kay" <michael.h.kay@n...>
  • RE: XPath 1.5? (was RE: typing and markup)
    • From: Elliotte Rusty Harold <elharo@m...>
  • Re: XPath 1.5? (was RE: typing and markup)
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